![Night view of a high-rise building with an open parallel window in the glass façade.](/sites/default/files/public/styles/page_header_large/public/2022-03/Reynaers-Aluminium-U-value-3.png?h=16a6ccf5&itok=8R6oQIZ-) 07 March 2022 # U-value: what does thermal insulation mean for your building project? Sustainable homes and buildings are the only way forward. Every aspect counts. A less known, yet extremely significant factor to measure energy efficiency is the U-value. The lower it is, the better the thermal efficiency or insulation. Rising energy costs and growing sustainability awareness have considerably increased the focus on a building’s energy performance. Efficiency standards – imposed and often made stricter by regulation – are a major indirect driving force behind enhancing the comfort level of a project. Thanks to an optimal U-value, you not only save energy, you also increase your quality of life. ![Detail view of the Reynaers Experience Centre’s glass façade.](/sites/default/files/public/styles/landscape_small/public/2022-03/Reynaers-Aluminium-U-value-1.jpg?h=7721ddbf&itok=Jzvmvbti) ![Woman indoors, standing in front of large sliding window.](/sites/default/files/public/styles/image_max_width/public/2022-03/Reynaers-Aluminium-U-value-2.jpg?itok=rKUMZdPa) Copyright [**Reynaers Campus: Experience Centre**](/get-inspired/aluminium-project-references/sliding-folding-solar-shading-windows-facades-reynaers-campus-experience-centre-duffel "Reynaers Campus: Experience Centre") – Jaspers-Eyers Architects (architect); Phillippe Van Gelooven, Georges De Kinder (photographers) Share this story - [f](https://www.facebook.com/sharer/sharer.php?u=https%3A//www.reynaers.africa/markdownify/node/6279%3Futm_source%3Dfacebook%26utm_medium%3Dsocial%26utm_campaign%3Dwebsite) - [t](https://twitter.com/intent/tweet?text=https%3A//www.reynaers.africa/markdownify/node/6279%3Futm_source%3Dtwitter%26utm_medium%3Dsocial%26utm_campaign%3Dwebsite) - [l](https://www.linkedin.com/shareArticle?mini=1&url=https%3A//www.reynaers.africa/markdownify/node/6279%3Futm_source%3Dlinkedin%26utm_medium%3Dsocial%26utm_campaign%3Dwebsite) - [p](https://pinterest.com/pin/create/button/) - [m]() ## You might also like [ See all stories ](/stories) - ![Quality expert testing aluminium profile sample.](/sites/default/files/public/styles/teaser_medium/public/2022-04/Reynaers-Aluminium-quality-certification-2.jpg?h=61f1cca7&itok=tII9DaTY) ### Our quality certifications [](/inspiration/stories/our-quality-certifications) Read this - ![Man holding and pointing at aluminium section sample.](/sites/default/files/public/styles/teaser_medium/public/2025-05/reynaers-aluminium-eco-design-2_1.jpg?h=f0ab467d&itok=wIS_hUaC) ### Eco Design at Reynaers Aluminium: Creating a Better Future [](/inspiration/stories/sustainability/eco-design-reynaers-aluminium-creating-better-future) Read this [ See all stories ](/stories)